Question

I have used the following code.

MainView.h:

NSString *sCopySource;
NSString *sFileSource;

// retain and copy used both for test proposes
@property (nonatomic, retain) NSString *sCopySource;
@property (nonatomic, copy) NSString *sFileSource;

MainView.m:

// Inside the first method:
sCopySource = [NSString stringWithFormat:@"%@%@", path1, filename];
sFileSource = [NSString stringWithFormat:@"%@%@", path2, filename];

// Inside the second method:
[[NSFileManager defaultManager] copyItemAtPath:sCopySource toPath:sFileSource error:&err];

And take error in the last line of the code by zombie-enabled objects sCopySource and sFileSource:

message sent to deallocated instance

Why? The properties marked as retain and copy. How to fix this?

Thanks a lot for the help!

P.S. Please don’t answer to use ratain and release methods. They’re extremely inconvenient.

Answer 1

You have defined the property, but you are writing directly to the instance variable.

If you want to use the retain/release logic in the property, you need to use:

  self.sCopySource = [NSString stringWithFormat:@"%@%@", path1, filename];
  self.sFileSource = [NSString stringWithFormat:@"%@%@", path2, filename];

That way, the methods that do the copy and retain are used.